Question

I need help with (b) vertex
everything else is right
I get -7/2 but it says is wrong

Answer 1

what is the y-coordinate.?
there is only x-coordinate

Answer 2

x coordinate of vertex

h = -b/(2a)
h = -14/(2*1)
h = -7

you somehow forgot to get rid of the 2 when you went from -14/2 to -7/2

Answer 3

oh nvm, a = 2, my bad

Answer 4

h = -b/(2a)
h = -14/(2*2)
h = -14/4
h = -7/2 ... fraction form
h = -3.5 ... decimal form

Answer 5

wow, I've been doing it right the whole entire time and I just needed to change into decimal form.. @jim_thompson5910 thanks you saved my life!

Answer 6

lol!

Answer 7

you're welcome. It was just a guess really because I noticed that the x intercepts were in decimal form

Answer 8

for the other part I got -46 and it says its wrong o.o @jim_thompson5910

Answer 9

y = 2x^2 + 14x + 10

y = 2(-3.5)^2+14(-3.5)+10 ... replace every x with -3.5

y = -14.5

not sure how you got -46

Answer 10

@jim_thompson5910 messed up the signs when multiplying thanks again! and you are very quick at doing math btw!

Answer 11

you're welcome. I used a calculator